Port android_webview_tests.gypi to GN.

android_webview/android_webview_tests.gypi

Index: android_webview/android_webview_tests.gypi
diff --git a/android_webview/android_webview_tests.gypi b/android_webview/android_webview_tests.gypi
index a5af244569d70c20e91bffa1b51324ad00ab01d3..6a2cf650250354324613c98b237f52a16edbaaef 100644
--- a/android_webview/android_webview_tests.gypi
+++ b/android_webview/android_webview_tests.gypi
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 {
   'targets': [
+    # GN: //android_webview/test:android_webview_apk
     {
       'target_name': 'android_webview_apk',
       'type': 'none',
@@ -93,6 +94,7 @@
       ],
       'includes': [ '../build/apk_fake_jar.gypi' ],
     },
+    # GN: //android_webview/test:android_webview_test_apk
     {
       'target_name': 'android_webview_test_apk',
       'type': 'none',
@@ -117,6 +119,7 @@
         '../build/android/test_runner.gypi',
       ],
     },
+    # GN: //android_webview/test:android_webview_unittests
     {
       'target_name': 'android_webview_unittests',
       'type': '<(gtest_target_type)',
@@ -157,6 +160,7 @@
         'native/state_serializer_unittest.cc',
       ],
     },
+    # GN: //android_webview/test:android_webview_unittest_java
     {
       'target_name': 'android_webview_unittest_java',
       'type': 'none',
@@ -170,6 +174,7 @@
       },
       'includes': [ '../build/java.gypi' ],
     },
+    # GN: //android_webview/test:android_webview_unittests_jni
     {
       'target_name': 'android_webview_unittests_jni',
       'type': 'none',
@@ -182,6 +187,7 @@
       },
       'includes': [ '../build/jni_generator.gypi' ],
     },
+    # GN: //android_webview/test:android_webview_unittests_apk
     {
       'target_name': 'android_webview_unittests_apk',
       'type': 'none',
@@ -205,6 +211,7 @@
       ],
       'includes': [ '../build/apk_test.gypi' ],
     },
+    # GN: //android_webview/test:libdrawgl
     {
       'target_name': 'libdrawgl',
       'type': 'shared_library',
@@ -222,6 +229,7 @@
           '../android_webview/test/shell/src/draw_gl/draw_gl.cc',
       ],
     },
+    # GN: //android_webview/test:libstandalonelibwebviewchromium
     {
       'target_name': 'libstandalonelibwebviewchromium',
       'includes': [